Renewable fuse



Dec. 26, 1922.

3.1. MCLEAN, JR.

RENEWABLE FUSE.

FILED OCT. 4, 1921.

rulli/:11n r a,

L@ Aller/25V Fiyi ifi, is renewable inseh so arnse element can lie readily he saine burns or brefs,

of the invention is the pro" 'whereby ready access may e element for replacement the invention is iovably oony anhin grooves formed ii act blades.,` and holding them 'in' such position and preventing any undesired displacement thereof.

A still further object of the invention is the provision of a renewable fuse such as above referred to, which will be comparatively simple and inexpensive to manufacture, reliable and eflicient in use', and readily operated.

With the above and other objects in view, the present invention resides in the novel features of construction, formations, cornbinations and arrangements of parts to be hereinafter more fully described, claimed and illustrated in the accompanying drawingyq forming a` part of the present application; and in whichj i .i still provision nectinp; the

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isaxsao Parser and9 '4 the lookeci erring new to 'the accompanying drawt Jy eorresponding` eharacters of reference throughout the several views. the numeral l() designates in general my improved renewable fusevhieh comprises a easing 1l of cylindrical formation, formed from fibre or other nonconduoting material, and ter minaily equipped with caps l2 and 18, formed in their ends with slots M havingr inturned lips l5 to which the Contact blades 16 and 17 are connected.

These caps l2 and 13 are likewise provided 'with suitable openings 18 partially' closed by asbestos and Wire fabric designated at 19, to permit the gas contained Within the easing' ll to escape therefrom case the fuse element 2O burns out.

rlhe inner ens of the Contact blades are provided with grooves 2l inf which the ends of the fuse element 2O are placed. Latch members 22 are pivoted at 23 to 'the Contact blades and are provided with 'finger grips 24 arranged so that thesaine can be moved readily to and from their'operative posin tions.

In placing the fuse element 20 in position, the ends thereof are inserted in the grooves 21 and the latches 22 are moved to engage the saine and cover up the said grooves to prevent the displaceinent'of the said elenient.

The cap 12 is retained in osition by means of screws shown at 25 W ich engage notches 26 formed in the end of said cap. The cap 13 is likewise retained in position by similar screws 27 and in addition by locking pins shown at 28.

These pins pass through sleeves 29 inserted. in the side of the casing l1 and rive position.

eted therein against displacement, and are adapted to engage openings 30 termed in the caps 13 so that when in the position shown in Figure 2 they will loch. this cap against any undesired displacement.

r1`he inner ends of the pins 255 are .t'ormed with openings 31 which have inserted therein the tree ends of the springs 32 which latter are engaged by the s'rips shown at 33, and these said springs are also bent around the inner ends of sleeves29, as clearly shown in Figure 7.

rllhe strips 33 are provided with spring clips 34, which engage `the if'ree ends or' the springs 321 and retain the pins 28 in ine-pera tive position, while additional clips shown at 35 are secured to the helical portions of the springs 'for supporting the latter aga-inst any undesired displacement.

When it is desired, to replace the iluseelement 20, the pins 28 are pushed inwardly by the springs 32 out ot their ingagement with the openings 30 until the clips 3a enga-ge the free ends of the springs 32 thus retaining the pins in theirretracted position. rlfhe screw elements 27 are then loosenedand the cap 13 may be readily removed carrying ywith vit the contact blades 17. The-lower latch is then removed from engagement with the lower end of the fuse element 2O and the end thereof can be removed from the .lower groove 21. A. new fuse element is then insertedin the said lower groove and the lower latch moved to locking position. The upper end ot the fusey element is then placed in the upper groove 21 and at the same time the cap is replaced and the upper latch moved to locking position, the beve-lled ends thereof forcing the pins 28 into the openings 30 locking the cap 13 inthe desired From the foregoing description taken in connection with the accompanying drawing, it will' be readily seen that a removable fuse is provided which will fulfil all of the necessary requirements of such a device, and it should be understood in this connection that various minor changes in the specific details of construction can be resorted to within the scope of the appended claims, withoutA departing from the spirit or sacrificing any of the advantages of the invention.

Having thus fully described the invention, what l claimv as new and desire to secure by Letters Patent is 1. rlhe herein described device including a casing, a cap engaging one end thereof, a contact blade carried by the cap, said blade having a groove therein, a fuse element engaging said groove, and a latch pivoted to the contact blade for preventing the displacement of the said fuse element.

2. A renewable fuse of the character described, including a casing, a pair of caps i y incasso engaging the opposite thereof, contact blades carried by said caps and extending within the said casing, said contact blades having grooves therein, fuse element engaged in said grooves, latches pivoted to the contact members for closing the grooves and retaining the iuse ele; rent in position and means tor locking one the caps-against displacement.

3. .it renewable fuse or comprising an insulating ca n gaging the opposite blades carried by the ca ay `*ended into said casing, said 'contact des having` grooves termed therein, a i* element engaged within said grooves, latches carried by the Contact members closing the grooves and retaining aie i. element in position, and spring pins l said caps against displacem it.

fi. A renewable inse of the pe described comprising a libre casing or cylindrical for mation, caps engaging the ends thereof, said caps having slots in their ends and intnrned lips at one edge oi said slots, contact blades secured to said lips and extending; .within the casing, grooves formed therein, a 'fuse element seated in said grooves, latches pivoted to the contact blades for closing said grooves and retaining the fuse element against displace ment, pips movable through the sides of the casing into engagement with one of the caps, and springs for actuating said pins.

5. A renewable fuse oi' the type described, comprising a casing formed from insulating material, said casing being of cylindrical formation, caps engaging the ends of said casing, said .capshaving slots formed at the ends thereof, and lips at the edges of said slots extending into the casing, contact blades secured to said lips and projecting into the casing, said contact blades having grooves formed therein, a fuse element having its. ends engaged within said grooves, latch members pivoted to the contact blades for extension into the casing, and closing the grooves and retaining the fuse element against displacement from the grooves, sleeves inserted through the sides of the casing adjacent one end thereof, one of said caps having openings therein in alignment with the openings in the sleeves, pins slidable through said sleeves for engagement with the openings in the cap, a spring engaging each of said pins, and means engaging the spring for retainingthe pins in inoperative position, substantially as and for the purposes set forth.

ln witness whereof l have hereunto set,

my hand.

lilANDOLPHy J. MGLEAN, Administrator of Randolph Mclean, Jr., dc-

ceased.

said contact blades having i 

